diff --git a/file_upload/upload_image.lua b/file_upload/upload_image.lua
index 36b7774..3d42697 100644
--- a/file_upload/upload_image.lua
+++ b/file_upload/upload_image.lua
@@ -8,9 +8,9 @@ local form, err = upload:new(chunk_size)
 
 local output_image_filename_uuid = uuid.generate();
 
+
 if not form then
     ngx.log(ngx.ERR, "failed to new upload: ", err)
-    ngx.say("failed to new upload: ", err)
     ngx.exit(500)
 end
 
@@ -42,7 +42,7 @@ local upload_image_index = 1
 while true do
     local typ, res, err = form:read()
     if not typ then
-        ngx.say("failed to read: ", err)
+        ngx.log(ngx.ERR, "failed to read: ", err)
         return
     end
     if typ == "header" then
@@ -60,8 +60,7 @@ while true do
                     local kvfile = string.split(seg, "=")
                     upload_image_filename = string.sub(kvfile[2], 2, -2)
 
-                    ngx.say(" -->> POST : Upload origin image is ", upload_image_filename)
-                    ngx.say("\n")
+                    ngx.log(ngx.INFO,"Upload origin image is ", upload_image_filename)
 
                     if upload_image_filename then
                         -- Save file name with generate uuid
@@ -69,15 +68,13 @@ while true do
                         save_image_filename = save_image_filename .. '.' .. upload_image_filename:match(".+%.(%w+)$")
                         fileToSave = io.open(saveRootPath .. save_image_filename, "w+")
                         if not fileToSave then
-                            ngx.say(" Error: Failed to open file ", save_image_filename)
+                            ngx.log(ngx.ERR, " Error: Failed to open file ", save_image_filename)
                             return
                         else
-                            ngx.say("Open file ok ", save_image_filename)
-                            ngx.say("\n")
+                            ngx.log(ngx.INFO, "Open file ok ", save_image_filename)
 
                             upload_image_table[upload_image_index] = saveRootPath .. save_image_filename .. " "
-                            ngx.say("Insert upload image table "..upload_image_index.." with "..upload_image_table[upload_image_index])
-                            ngx.say("\n")
+                            ngx.log(ngx.INFO, "Insert upload image table "..upload_image_index.." with "..upload_image_table[upload_image_index])
 
                             upload_image_index = upload_image_index + 1
                         end
@@ -107,36 +104,32 @@ while true do
     end
 end
 if ret_save then
-    ngx.say("Show all upload files\n")
+    ngx.log(ngx.INFO, "Show all upload files\n")
 
     -- Show all upload files
     upload_image_index = upload_image_index -1
     for i = 1, upload_image_index do
-        ngx.say("Save upload file is : " .. upload_image_table[i])
-        ngx.say("\n")
+        ngx.log(ngx.INFO, "Save upload file is : " .. upload_image_table[i])
     end
 
     image_append_coroutine = coroutine.create(
         function ()
             -- Append images
-            -- ngx.say("Upload image number is : " , upload_image_index )
+            -- ngx.log(ngx.INFO,"Upload image number is : " , upload_image_index )
             local append_images_path
             append_images_path = table.concat(upload_image_table)
-            ngx.say("Input images list  : " , append_images_path)
-            ngx.say("\n")
+            ngx.log(ngx.INFO, "Input images list  : " , append_images_path)
 
 --             local append_output_image = saveRootPath .. uuid.generate()..".jpg ";
             local append_output_image = saveRootPath .. output_image_filename_uuid..".jpg ";
-            ngx.say("Output image is : "..append_output_image)
-            ngx.say("\n")
+            ngx.log(ngx.INFO, "Output image is : "..append_output_image)
 
             -- Debug
-            ngx.say('/usr/local/ImageMagick/bin/magick convert -append '..append_images_path..' '..append_output_image)
-            ngx.say("\n")
+            ngx.log(ngx.INFO, '/usr/local/ImageMagick/bin/magick convert -append '..append_images_path..' '..append_output_image)
 
             local call_imagemagick_cmd = io.popen('/usr/local/ImageMagick/bin/magick convert -append '..append_images_path..' '..append_output_image)
             local imagemagick_cmd_replay = call_imagemagick_cmd:read("*all")
-            ngx.say(imagemagick_cmd_replay)
+            ngx.log(ngx.INFO, imagemagick_cmd_replay)
 
 
         end